General Description

The MAX9401/MAX9404 are extremely fast and low-

skew quad ECL/PECL differential buffers/receivers for

data and clock signals. The four channels can be oper-

ated synchronously with an external clock, or in asyn-

chronous mode, determined by the state of the SEL

input. An enable input provides the ability to force all

the outputs to a differential low state.

The MAX9401 has high-impedance (open) input and

the MAX9404 has an integrated 100

Ω differential input

termination, which reduces external component count.

Both devices have double amplitude swing open emit-

ter outputs suitable for driving long cables. The

to +5.5V supply range, and are specified for operation

from -40°C to +85°C. These devices are offered in

space-saving 32-pin 5mm x 5mm QFN exposed-paddle

(EP) and TQFP packages.

Applications

Data and Clock Driver and Buffer

Central Office Backplane Clock Distribution

DSLAM Backplane

Base Station

ATE

Features

o Differential Double-Swing ECL/PECL Outputs

o Input Compatible with LVECL/LVPECL

o Guaranteed 900mV Differential Output at 3.0GHz

Clock Rate

o 365ps Propagation Delay in Asynchronous Mode

o 10ps Channel-to-Channel Skew in Synchronous

Mode

o Integrated 100Ω Input Terminations (MAX9404)

o Compatible +3.3V/+5.0V Nominal Supplies

o Selectable Synchronous/Asynchronous

Operation

Quad ECL/PECL Differential

Buffers/Receivers

________________________________________________________________ Maxim Integrated Products

1

TOP VIEW

17

18

19

20

21

22

23

*

*

*

**

OUT2

OUT2

OUT1

OUT1

8

7

6

5

4

3

2

EN

EN

CLK

CLK

SEL

SEL

QFN-EP*

1

24

MAX9401/

MAX9404

MAX9401

MAX9404

32

28

29

30

31

25

26

27

10

13

15

14

16

11

12

9

17

18

19

20

21

22

23 OUT1

OUT1

OUT2

OUT2

2

3

4

5

6

7

8

EN

EN

CLK

CLK

SEL

SEL

1

TQFP

Pin Configurations

19-2245; Rev 0; 10/01

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

*Future product—contact factory for availability.

**EP = Exposed paddle

Ordering Information

PART

TEMP.

RANGE

PIN-

PACKAGE

INPUT

IMPEDANCE

MAX9401EGJ*

-40°C to

+85°C

32 QFN-EP**

(5mm x 5mm)

Open

MAX9401EHJ

-40°C to

+85°C

32 TQFP

(5mm x 5mm)

Open

MAX9404EGJ*

-40°C to

+85°C

32 QFN-EP**

(5mm x 5mm)

100

Ω

MAX9404EHJ

-40°C to

+85°C

32 TQFP

(5mm x 5mm)

100

Ω

Functional Diagram appears at end of data sheet.